@Homer, That is not possible. Airtel CC now says Airtel Money Wallet are complimentary which comes bundled with Airtel mobile numbers and once you have upgraded it to Payments Bank account, if you close it you can re-open only another Payments Bank account with same number.
in my Airtel Payments bank section in the app always says "update KYC" but when I click on it then says "You're all set"
Also I don't get cashbacks while making payments/recharges, it says update KYC to get ₹40 cashback.